Buggy code:
public class STEADExportManager extends TextExportManager { private static final String GLOBAL_VAR_PREFIX = "_" ; private static final String LINE_SEPARATOR = System . getProperty ( "line.separator" ) ; private static final Pattern STEAD_OBJ_PATTERN = Pattern . compile ( "\\{(.*)\\}" ) ; private static final boolean GOTO_PAGE_NUMBERS = true ; private static final boolean ENABLE_COMMENTS = true ; public STEADExportManager ( NonLinearBookImpl nlb , String encoding ) throws NLBExportException { } @ Override protected String generatePreambleText ( ) { } protected String generateLibraryMethods ( ) { } @ Override protected String generateObjText ( ObjBuildingBlocks objBlocks ) { } @ Override protected String generatePageText ( PageBuildingBlocks pageBlocks ) { StringBuilder stringBuilder = new StringBuilder ( ) ; StringBuilder autosBuilder = new StringBuilder ( ) ; if ( STEADExportManager . ENABLE_COMMENTS ) { stringBuilder . append ( pageBlocks . getPageComment ( ) ) ; } stringBuilder . append ( pageBlocks . getPageLabel ( ) ) ; stringBuilder . append ( pageBlocks . getPageCaption ( ) ) ; stringBuilder . append ( pageBlocks . getPageImage ( ) ) ; stringBuilder . append ( "<seq2seq4repair_space>var<seq2seq4repair_space>{<seq2seq4repair_space>time<seq2seq4repair_space>=<seq2seq4repair_space>0;<seq2seq4repair_space>tag<seq2seq4repair_space>=<seq2seq4repair_space>'';<seq2seq4repair_space>}," ) . append ( STEADExportManager . LINE_SEPARATOR ) ; boolean hasPageTimer = StringHelper . notEmpty ( pageBlocks . getPageTimerVariable ( ) ) ; boolean hasAnim = pageBlocks . isHasObjectsWithAnimatedImages ( ) ; boolean timerSet = hasAnim || hasPageTimer ; if ( timerSet ) { stringBuilder . append ( "<seq2seq4repair_space>timer<seq2seq4repair_space>=<seq2seq4repair_space>function(s)<seq2seq4repair_space>s.time<seq2seq4repair_space>=<seq2seq4repair_space>s.time<seq2seq4repair_space>+<seq2seq4repair_space>1;<seq2seq4repair_space>" ) ; if ( hasPageTimer ) { stringBuilder . append ( pageBlocks . getPageTimerVariable ( ) ) . append ( "s.autos(s);<seq2seq4repair_space>" ) ; } stringBuilder . append ( "return<seq2seq4repair_space>s.time;<seq2seq4repair_space>end," ) . append ( STEADExportManager . LINE_SEPARATOR ) ; } stringBuilder . append ( pageBlocks . getPageTextStart ( ) ) ; autosBuilder . append ( "<seq2seq4repair_space>autos<seq2seq4repair_space>=<seq2seq4repair_space>function(s)" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; autosBuilder . append ( "<seq2seq4repair_space>revive();" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; List < LinkBuildingBlocks > linksBlocks = pageBlocks . getLinksBuildingBlocks ( ) ; for ( final LinkBuildingBlocks linkBlocks : linksBlocks ) { if ( linkBlocks . isAuto ( ) ) { autosBuilder . append ( generateAutoLinkCode ( linkBlocks ) ) ; } else { stringBuilder . append ( generateOrdinaryLinkCode ( linkBlocks ) ) ; } } autosBuilder . append ( "<seq2seq4repair_space>end," ) . append ( STEADExportManager . LINE_SEPARATOR ) ; boolean varsOrModsPresent = ( ! ( StringHelper . isEmpty ( pageBlocks . getPageVariable ( ) ) ) ) || ( ! ( StringHelper . isEmpty ( pageBlocks . getPageModifications ( ) ) ) ) ; stringBuilder . append ( pageBlocks . getPageTextEnd ( ) ) ; stringBuilder . append ( autosBuilder . toString ( ) ) ; stringBuilder . append ( "<seq2seq4repair_space>enter<seq2seq4repair_space>=<seq2seq4repair_space>function(s,<seq2seq4repair_space>f)" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; if ( varsOrModsPresent ) { stringBuilder . append ( pageBlocks . getPageModifications ( ) ) ; stringBuilder . append ( pageBlocks . getPageVariable ( ) ) ; } stringBuilder . append ( "<seq2seq4repair_space>s.snd(s);" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; stringBuilder . append ( "<seq2seq4repair_space>s.bgimg(s);" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; if ( timerSet ) { stringBuilder . append ( "<seq2seq4repair_space>s.time<seq2seq4repair_space>=<seq2seq4repair_space>0;" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; if ( hasPageTimer ) { <START_BUG> stringBuilder . append ( "<seq2seq4repair_space>" ) . append ( pageBlocks . getPageTimerVariable ( ) ) . append ( "<seq2seq4repair_space>=<seq2seq4repair_space>0;" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; <END_BUG> } stringBuilder . append ( "<seq2seq4repair_space>timer:set(" ) . append ( ( hasAnim ? 20 : 200 ) ) . append ( ");" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; } stringBuilder . append ( "<seq2seq4repair_space>s.autos(s);" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; stringBuilder . append ( "<seq2seq4repair_space>end," ) . append ( STEADExportManager . LINE_SEPARATOR ) ; if ( timerSet ) { stringBuilder . append ( "<seq2seq4repair_space>exit<seq2seq4repair_space>=<seq2seq4repair_space>function(s,<seq2seq4repair_space>t)" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; stringBuilder . append ( "<seq2seq4repair_space>timer:stop();" ) . append ( STEADExportManager . LINE_SEPARATOR ) ; stringBuilder . append ( "<seq2seq4repair_space>end," ) . append ( STEADExportManager . LINE_SEPARATOR ) ; } stringBuilder . append ( pageBlocks . getPageSound ( ) ) ; stringBuilder . append ( generateObjsCollection ( pageBlocks , linksBlocks ) ) ; stringBuilder . append ( decoratePageEnd ( ) ) ; return stringBuilder . toString ( ) ; } protected String generateObjsCollection ( PageBuildingBlocks pageBlocks , List < LinkBuildingBlocks > linksBlocks ) { } protected String generateOrdinaryLinkCode ( LinkBuildingBlocks linkBlocks ) { } protected String generateAutoLinkCode ( LinkBuildingBlocks linkBlocks ) { } @ Override protected String escapeText ( String text ) { } @ Override protected String decorateObjLabel ( String id ) { } @ Override protected String decorateObjComment ( String name ) { } @ Override protected String decorateObjStart ( final String id , boolean menuObj ) { } @ Override protected String decorateObjName ( String name ) { } @ Override protected String decorateObjImage ( List < ImagePathData > objImagePathDatas ) { } @ Override protected String decorateObjDisp ( List < TextChunk > dispChunks , boolean imageEnabled ) { } protected String getDispText ( List < TextChunk > dispChunks ) { } private String expandInteractionMarks ( String text ) { } @ Override protected String decorateObjText ( List < TextChunk > textChunks , boolean imageEnabled ) { } protected String getObjText ( List < TextChunk > textChunks ) { } @ Override protected String decorateObjTak ( final String objName ) { } @ Override protected String decorateObjInv ( boolean menuObj ) { } @ Override protected String decorateObjActStart ( List < TextChunk > actTextChunks ) { } protected String getActText ( List < TextChunk > actTextChunks ) { } @ Override protected String decorateObjActEnd ( ) { } @ Override protected String decorateObjUseStart ( ) { } @ Override protected String decorateObjUseEnd ( ) { } @ Override protected String decorateObjObjStart ( ) { } @ Override protected String decorateObjObjEnd ( ) { } protected String decorateUseTarget ( String targetId ) { } protected String decorateUseVariable ( String variableName ) { } protected String decorateUseModifications ( String modificationsText ) { }

Fix:
stringBuilder . append ( "<seq2seq4repair_space>" ) . append ( pageBlocks . getPageTimerVariable ( ) ) . append ( STEADExportManager . LINE_SEPARATOR ) ;